SHIP CONSTRUCTION & STABILITY SCS4 Start Date : January 4th, 2011 End Date : March 4th, 2011 Daily Class Times : 0830 - 1600 This is a course designed to provide ship’s officers and captains with the knowledge and skill required to: understand the basic design and construction of various types of vessels; perform stability calculations with emphasis on practical skills; extract data from hydrostatic tables and curves, perform calculations related to ship’s drafts, trim, list and initial stability. This course follows the guidelines of STCW95, parallels the framework of the IMO Model Courses and fulfills the requirements of the applicable sections of TP2293 and IMO Model Courses 7.01 and 7.03. COURSE GOALS Upon successful completion of this course, learners will have: 1. Working knowledge and application of stability, trim and stress tables, diagrams and stress-calculating equipment 2. Understanding of fundamental actions to be taken in the event of partial loss of intact buoyancy 3. Understanding of the fundamentals of watertight integrity COURSE OUTCOMES Upon successful completion of this course, you will be able to meet the outcomes specified in TP2293:
Knowledge required
Competence:
Maintain seaworthiness of the ship
Working knowledge and application of stability, trim and stress tables, diagrams and stress-calculating equipment
Displacement
Definition of displacement; Given a displacement/draught curve or table find:
a) Displacement for given mean draughts;
b) Mean draught for given displacements;
c) The change in mean draught when given masses are loaded or discharged;
d) The mass of cargo to be loaded or discharged to produce a required change of draught;
Definition of light displacement and load displacement; Definition of deadweight; Ability to use a deadweight scale to find the deadweight and displacement of a ship at various draughts in seawater; Definition of tonnes per centimetre immersion; Why TPC varies with different draughts; Ability to use a deadweight scale to obtain TPC at given draughts;
Ability to use TPC obtained from a deadweight to find:
a) The change of mean draught when given masses are loaded or discharged;
b) The mass of cargo to be loaded or discharged to produce a required change of draught;
Definition of block coefficient (CB); Ability to calculate CB from given displacement and dimensions; Ability to calculate displacement from given CB and dimensions. Buoyancy
Meaning of buoyancy; Definition of force of buoyancy; What is meant by reserve buoyancy;
Explain the importance of reserve buoyancy; Explain the purpose of load lines; Explain the requirement for maintaining water tight integrity; Ability to demonstrate an understanding of damage stability requirements for certain vessels; The reasons for damage stability requirements;
Ability to identify damage stability requirements for Type A vessels, Type (B-60) and Type (B-100) vessels; Identify equilibrium condition after flooding for Type A, and all Type B vessels; Identify damage stability requirements for passenger vessels. Fresh Water Allowance
Why the draught of a ship decreases when it passes from fresh water to seawater and vice versa; Given the FWA and TPC for fresh water, ability to calculate the amount which can be loaded after reaching the summer load line when loading in fresh water before sailing into seawater; Ability to use a hydrometer to find the density of dock water; Given the density of dock water and TPC for seawater, ability to calculate the TPC for dock water; Given the density of dock water and FWA, ability to calculate the amount by which the appropriate load line may be submerged; Given the present draught amidships and the density of dock water, ability to calculate the amount to load to bring the ship to the appropriate load line in seawater.
Working knowledge and application of stability, trim and stress tables, diagrams and stress-calculating equipment
Statical stability
Definition of centre of gravity (G); Definition of centre of buoyancy (B);
Definition of the lever GZ; How variations in displacement and GZ affect the stability of the ship;
Ability to draw a diagram of a heeled ship, showing:
a) The forces B and G;
b) The lever GZ Initial stability
Definition of the transverse metacentre (M); Ability to draw a diagram of a ship heeled to a small angle and indicate G,B,Z and M; Definition of GM; Ability to show that for small angles of heel (q), GZ = GM X sin q;
Ability to describe the effect on a ship’s behavior of:
a) A large GM (stiff ship)
b) A small GM (tender ship)
Ability to use hydrostatic curves to find the height of the metacentre above the keel (KM) at given draughts; Given the values of KG, ability to use the values of KM obtained from hydrostatic curves to find the metacentre height, GM. Given a ship’s hydrostatic data and the disposition of cargo, fuel and water, calculate the metacentric height (GM); Ability to calculate the arrival GM from the conditions at departure and the consumption of fuel and water; Ability to identify when the ship will have the worst stability conditions during the passage; Ability to calculate the maximum weight which can be loaded at a given height above the keel to ensure a given minimum GM. Angle of Loll
Ability to show that if G is raised above M, the couple formed by the weight and buoyancy force will turn the ship further from the upright; How B may move sufficiently to reduce the capsizing moment to zero at some angle of heel; Definition of angle of loll; An unstable ship may loll to either side, why this condition is potentially dangerous. Curves of Statical Stability
Ability to identify cross curves (KN curves and MS curves); Derive the formula GZ = MS + GM sin; Derive the formula GZ = KN – KG sin; Derive GZ curves for stable and initially unstable ships from KN curves;
From a given curve of statical stability, ability to obtain:
a) The maximum righting lever and the angle at which it occurs;
b) The angle of vanishing stability;
c) The range of stability.
Ability to construct a GZ curve for a given displacement and KG and checks that the ship meets the minimum intact stability requirements; Ability to show how lowering the position of G increases all values of the righting lever and vice versa.
Working knowledge and application of stability, trim and stress tables, diagrams and stress-calculating equipment
Movement of the Centre of Gravity
Ability to calculate the movement of G (GG1) from: GG1 = mass added or removed X distance of mass from G new displacement of the ship GG1 = mass moved X distance mass is moved displacement of the ship Perform calculations as in the above objective to find the vertical and horizontal shifts of the centre of gravity resulting from adding, removing, moving or suspending masses; Ability to calculate, by using moments about the keel, the position of G after loading or discharging given masses at stated positions;
Ability to calculate the change in KG during a passage resulting from:
a) Consumption of fuel and stores
b) Absorption of water by a deck cargo
c) Accretion of ice on decks and superstructures given the masses and their positions. List and its correction
Ability to show on a diagram the forces which cause a ship to list when G is to one side of the centre line; Ability to show on a diagram that the angle of list (q) is given by: tan q = GG1 GM
Where GG1 is the transverse shift of G from the centre line.
Given the displacement, KM and KG of a ship, ability to calculate the angle of list resulting from loading or discharging a given mass at a stated position, or from moving a mass through a given transverse distance; With reference to moments about the centre line, ability to explain how the list may be removed; Given the displacement, GM and the angle of list of a ship, ability to calculate the mass to load or discharge at a given position to bring the ship upright; Given the displacement, GM and angle of list of a ship, ability to calculate the mass to move through a given transverse distance to bring the ship upright; Given the draught, beam and rise of the floor, ability to calculate the increase in draught resulting from a stated angle of list; Ability to determine the expected maximum heel during the loading or discharging of a heavy lift with the ship’s gear; Ability to calculate the increased draught resulting from the heel. Effect of slack tanks
Ability to show by means of diagrams how the centre of gravity of the liquid in a partly filled tank moves during rolling. Effect of wind and effect of water on deck
Understanding the effect of severe wind and rolling in associated sea conditions, especially in following seas; Effect of water on deck includes free surface effect.
Working knowledge and application of stability, trim and stress tables, diagrams and stress-calculating equipment
Trim
Definition of trim; Definition of centre of flotation (CF); Ability to use hydrostatic data to find the position of the centre of flotation (CF) for various draughts; Definition of a trimming moment; Definition of the moment to change trim by 1 cm (MCT 1 cm); Ability to use hydrostatic curves/tables or deadweight scale to find the MCT 1 cm for various draughts; Given the value of MCT 1 cm, masses moved and the distances moved forward or aft, ability to calculate the change in trim; Given the value of MCT 1 cm, the position of the centre of flotation, masses added or removed and their distances forward of or abaft the centre of flotation, ability to calculate the change of trim; Given initial draughts and the position of the centre of flotation, ability to extend the calculation in the above objective to find the new draughts; Given initial draughts and TPC, ability to extend the calculation in the above objective to find the new draughts; Given initial draughts and TPC, ability to extend the calculation to find the new draughts; Ability to use a trimming table or trimming curves to determine changes in draughts resulting from loading, discharging or moving weights; Ability to calculate how to divide a given mass between two given locations to produce a required trim or maximum draught after loading; Ability to calculate the locations at which to load a given mass so as to leave the after draught unchanged ability to calculate final draughts and trim for a planned loading by considering changes to a similar previous loading.
Understanding of fundamental actions to be taken in the event of partial loss of intact buoyancy
Knowledge that flooding should be countered by prompt closing of watertight doors, valves and any other openings which could lead to flooding or other compartments; Knowledge that cross-flooding arrangements, where they exist, should be put into operation immediately to limit the resulting list; Knowledge that any action, which could stop or reduce the inflow of water, should be taken.
Understanding of the fundamentals of watertight integrity
Understanding of the fundamentals of watertight integrity.
General knowledge of the principal structural members of a ship and the proper names for the various parts
Ship dimensions and form
General arrangement of different types of ship; Ability to draw an elevation of the principal ship types, showing holds, engine room, peak tanks, double bottom tanks, hatchways and position of bulkheads; Ability to draw an elevation of a typical crude oil carrier, showing bulkheads, cofferdams, pump-room, engine-room, bunker and peak tanks, cargo tanks and permanent ballast tanks; Ability to draw a plan view of a tanker, showing the arrangement of cargo and ballast tanks; Definitions of the different dimensions and forms.. Ship stresses
Describe in qualitative terms shear force and bending moments; What is meant by hogging and sagging; Ability to describe the loading conditions which give rise to hogging and sagging stresses; How hogging and sagging stresses are caused by the sea state;
How hogging and sagging stresses result in tensile or compressive forces in the deck and bottom structure; Describe water pressure loads on the ship’s hull; Describe liquid pressure loading on the tank structures; Ability to calculate the pressure at any depth below the liquid surface, given the density of the liquid; Describe the stresses set up by liquid sloshing in a partly filled tank; Describe racking stress and its causes; What is meant by panting and which part of the ship is affected;
What is meant by pounding or slamming and which part of the ship is affected; Describe the stress caused by localized loading; Ability to demonstrate understanding of modern methods of determining the effects of different loading and ballasting on the ship’s structure; Ability to use modern computer software for determining stress; Have a working knowledge of the stress tables; How output data from ship stress finding system may be used; Torsion stress particularly with reference to container ship loading; Ability to analyze the stress areas created by bending moments and shearing forces derived by a stress indicator; Analyze the causes and effects of shearing forces and bending moments on ship’s structures; Definition of bending moment; Definition of Shearing forces; Ability to extract information from shear force and bending moment diagrams; Describe the constructional features, which compensate for stress. Hull structure
Ability to identify structural components on ship’s plans and drawings:
a) Frames, floor, transverse frames, deck beams, knees, brackets
b) Shell plating, decks, tank top, stringers
c) Bulkheads and stiffeners, pillars
d) Hatch girders and beams, coamings, bulwarks
e) Bow and stern framing, cant beams, breasthooks
Ability to describe and illustrate standard steel sections:
a) Flat plate
b) Offset bulb plate
c) Equal angle
d) Unequal angle
e) Channel
f) Tee Ability to identify longitudinal, transverse and combined systems of framing on transverse sections of the ships; Ability to sketch the arrangement of frames, webs and transverse members for each system; Ability to illustrate double-bottom structure for longitudinal and transverse framing; Ability to illustrate hold drainage systems and related structure; Ability to illustrate a duct keel; Ability to sketch the deck edge, showing attachment of sheer strake and stringer plate; Ability to sketch a radiused sheer strake and attached structure; Describe the stress concentration in the deck round hatch openings; Explain compensation for loss of strength at hatch openings; Ability to sketch a transverse section through a hatch coaming, showing the arrangement of coamings and deep webs; Ability to sketch a hatch corner in plan view, showing the structural arrangements; Ability to sketch deck-freeing arrangements, scuppers, freeing ports, open rails; Ability to illustrate the connection of superstructures to the hull at the ship’s side; Ability to sketch a plane bulkhead, showing connections to deck, sides and double bottom and the arrangement of stiffeners; Ability to sketch a corrugated bulkhead; Why transverse bulkheads have vertical corrugations and for-and-aft bulkheads have horizontal ones; Ability to describe the purpose of bilge keels and how they are attached to the ship’s side.
General knowledge of the principal structural members of a ship and the proper names for the various parts
Ability to identify longitudinal, transverse and combined systems of framing on transverse sections of the ships; Ability to sketch the arrangement of frames, webs and transverse members for each system; Ability to illustrate double-bottom structure for longitudinal and transverse framing; Ability to illustrate hold drainage systems and related structure; Ability to illustrate a duct keel; Ability to sketch the deck edge, showing attachment of sheer strake and stringer plate; Ability to sketch a radiused sheer strake and attached structure; Describe the stress concentration in the deck round hatch openings; Explain compensation for loss of strength at hatch openings; Ability to sketch a transverse section through a hatch coaming, showing the arrangement of coamings and deep webs; Ability to sketch a hatch corner in plan view, showing the structural arrangements; Ability to sketch deck-freeing arrangements, scuppers, freeing ports, open rails; Ability to illustrate the connection of superstructures to the hull at the ship’s side; Ability to sketch a plane bulkhead, showing connections to deck, sides and double bottom and the arrangement of stiffeners; Ability to sketch a corrugated bulkhead; Why transverse bulkheads have vertical corrugations and for-and-aft bulkheads have horizontal ones; Ability to describe the purpose of bilge keels and how they are attached to the ship’s side. Bow and Stern
Describe the provisions of additional structural strength to withstand pounding; Describe and illustrate the structural arrangements forward to withstand panting; Describe the function of the sternframe; Describe and sketch a sternframe for a single-screw ship; Describe and illustrate the construction of a transom stern, showing the connections to the sternframe. Fittings Describe and sketch an arrangement of modern weather-deck mechanical steel hatches;
How water tightness is achieved at the coamings and cross joints; Describe the cleating arrangements for the hatch covers; Ability to sketch an oil tight hatch cover; Describe roller, multi-angle, pedestal and panama fairleads; Ability to sketch mooring bitts, showing their attachments to the deck; Ability to sketch typical forecastle mooring and anchoring arrangements, showing the leads of moorings; Describe the construction and attachment to the deck of tension winches and explain how they are used; Describe the anchor handling arrangements from hawse pipe to spurling pipe; Describe the construction of chain lockers and how cables are secured in the lockers; How to secure anchors and make spurling pipes watertight in preparation for a sea passage; Describe the construction and use of a cable stopper; Describe the construction of masts and Sampson posts and how they are supported at the base; Describe the construction of derricks and deck cranes; Describe the bilge piping system of a cargo ship; Describe and sketch a bilge strum box; Describe a ballast system in a cargo ship; Describe the arrangement of a fire main; Describe the provision of sounding pipes and sketch a sounding pipe arrangement; Describe the fitting of air pipes to ballast tanks or fuel oil tanks; Describe the arrangement of fittings and lashings for the carriage of containers on deck.
General knowledge of the principal structural members of a ship and the proper names for the various parts
Rudder and propellers
Ability to describe the action of the rudder in steering a ship; Drawing of modern rudders: semi balanced, balanced and spade; Explain the purpose of the rudder carrier and pintles; How the weight of the rudder is supported by the rudder carrier; Ability to describe a rudder trunk; Ability to describe the arrangement of a watertight gland round the rudder stock; The principle of screw propulsion; Describe a propeller and define boss, rake, skew, face, back, tip, radius, pitch;
Compare fixed-pitch with controllable-pitch propellers; Ability to sketch the arrangement of an oil lubricated stern tube and tail shaft; Ability to sketch a cross-section of a shaft tunnel; Why the shaft tunnel must be of watertight construction and how water is prevented from entering the engine-room if the tunnel becomes flooded. Load lines and draught marks
Explain where the deck line is marked; Definition of freeboard; What is meant by assigned summer freeboard; Ability to distinguished between ships of Type A and Type B for the purposes of computation of freeboard; Ability to draw to scale the load line mark and the load lines for a ship given summer moulded draught, displacement and tonnes per centimetre immersion in salt water; Ability to use the chart of zones and seasonal areas to determine the load lines which apply for a particular passage; Given the ship’s hydrostatic data and the daily consumption of fuel and water, ability to determine the minimum departure freeboard and quantity to load, taking into account the zones, seasonal zones and areas through which the ship will pass; Ability to calculate the maximum quantity to load, taking account of loading, discharging and bunkering at an intermediate port or ports, so as to comply throughout with the load line regulations; Demonstrate how to read draughts.
EVALUATION PLAN – APPROVED COURSE
EVALUATION INSTRUMENT
M/C & S/A QUESTIONS
ESSAY QUESTIONS
CALCULATION QUESTIONS
PERCENTAGE /100
Assignment CON1
3
5
Assignment CON2
3
5
Assignment STAB1
1
1
5
Assignment STAB2
1
1
5
Mid Term Exam
25
4
1
20
Final Exam
25
1
4
60
Total
100
The pass mark is an average of 70% with a minimum of at least 60% on any exam or assignment. 90% attendance is required. Progress in this course will require class participation and completion of exercises. Principles and problem solving in this course build on themselves; missed material frequently results in difficulties in later stages of the course. It will be your responsibility to catch up on any missed lectures and exercises. MATHEMATICS A math refresher course is available between 1500 and 1700, Monday to Thursday during the first 2 weeks. Refer to the schedule. This math refresher is specific to this course and available to registered nautical students only. Math (general college) tutorial is available throughout the course; refer to math handout for additional information.
BOOKS & SUPPLIES
Mandatory: 1. Student Manual 2. Ship Knowledge by Klaas Van Dokkum 3. Ship Stability for Mates/Masters by Seamanship International
Ship Construction (6th Edition) – D. J. Eyres
Recommended (additional):
Merchant Ship Construction (6th Edition) – H. J. Pursey
Merchant Ship Stability (7th Edition) – H. J. Pursey
Ship Stability for Masters and Mates (5th Edition) – Derrett
Handout material will be given on loan bases and will include a stability book. All loaned material must be returned to the instructor by the last day of the course. A scientific calculator capable of performing trigonometric functions, inverse functions, etc is a must for the course. Use of tables to problem solve will require more time than is available. The recommended calculator is the Sharp EL-531W DAL. INCOME SUPPORTED STUDENTS Any student on any form of income support may be required to “sign in” daily. Arrangements will be made with the staff in the Trades and Technology office for signing in.
ADDITIONAL ACADEMIC ASSISTANCE
If you require additional assistance with study skills, mathematics, etc., the following services are available to you on campus: Ø Learning Skills Counselor located in Campus Centre at the counseling/Advising centre Ø Math Review – TB260 between 1500 & 1700 Monday – Thursday for first 2 weeks of class. Ø Math Lab (available sometimes) located in Technologies Centre 142 (down stairs) & in the Jack White Building, location to be discussed. As well, if you would like to have your learning style assessed, contact Advising located in Campus Centre, near registration or call 370-3550.
LOCKERS
Lockers may be rented from the bookstore at a monthly fee and a lock deposit. Make sure that you identify yourself as a Nautical Student. Lockers next to the classrooms are reserved for you.
STUDENT ID CARD
You must get one of these. Available from the library, you must present yourself along with photo ID and confirmation of current local address. The card will allow you access to the library, discounts at specific venues, may be used as a photocopy card and as a bus pass.
BUS PASS
May be included in the cost of your tuition, obtained from the library. It is set up on your College ID. You swipe the card when entering the bus. COMPUTER ACCESS Included in the cost of your tuition. You are entitled to set up an e-mail account and have access to the World Wide Web in the computer labs located at Camosun College. You must go to the library to set up your account, username and password. Refer to the posted instructions for set up and logon procedure. In addition to access to e-mail and the WWW, computers in our lab have training programs for stability. When using the computers/internet, please do not download programs, files, etc to the hard drive. If there is anything that you would like to save, please do so on a disk. If you do find a site that you feel is of interest to the class, please note the address and discuss it with the instructor. As well, please do not set up personalized folders. Please note that site access is closely monitored by Computing Services and Campus Security. Refer to the posted Lab Procedures. NAUTICAL LIBRARY There is a very good collection of old and new nautical texts located in the Instructor’s office, room 267. The texts are both the property of the college and personally owned by myself. If you want access, please ask me and a time will be arranged. This room/office is not to be accessed without an instructor present. LIBRARY Located in Campus Centre, level 3. It contains a nautical section with a variety/limited number of nautical text. There is a restriction on the loan period and fine structure in place for overdue books. Each loan period is at a maximum of 3 weeks with a maximum of 3 renewals (9 weeks total). This is based on no other student needing access to the text. Renewals may be made online. LUNCH TIME WORKSHOPS Free workshops are available at the learning skills centre, located in the Campus Centre. Refer to posting around the building. PRINTING/PHOTOCOPYING There are photocopy machines located throughout the campus and in the library, accessible with a Card that may be purchased at the bookstore or an account set up on your College ID. The computers, located in the lab, are connected to the printer and it is for your use. In addition, the Camosun Print Shop provides a service to students (at a fee). If you have large amounts of copying to do, the print shop may be your best option. PARKING Parking is available in designated lots around the campus and may be accessed with a ticket pass purchased though a dispenser or a longer term pass purchased through the machines located on campus. Please note that the reserved spaces are not for students. Tickets may be purchased for periods of 4 hours, 1 day, weekly and monthly. Campus parking is contracted to Robbins and is not the responsibility of the college. They have their own monitors and issue their own parking violation tickets. Any dispute that you may have must be directed to this company. FOOD AND DRINK Available at the Cook Training Centre (Helmut Huber Bldg) and the Coffee Shop. Please refer to posted operating hours. As well, coffee and snacks are frequently available at satellite venues throughout the campus. The classroom (not the computer lab or electronics lab) may be used during lunch hours and coffee breaks and coffee is permitted during regular class hours. Ensure that all litter is disposed of in the garbage container and not left in the desks. This is both a personal and a public health concern. Consumption of food is not permitted during class. SMOKING Permitted outside in designated locations away from the entrance to the building, wherever you can find a butt can. The deck may not be used for smoking. CELL PHONES AND PAGERS Please ensure that the audio ringers on these devices are turned off during class and lab times. They are disruptive to both the instructor and your fellow students. CLASSROOM BREAKS We all need them. As the course proceeds, the majority of you will find yourselves wanting to spend your coffee breaks and lunch hours completing homework or asking questions to the instructor or fellow student. This will burn you out. Take your breaks to go for a walk or read a book, you need them. If possible, please allow the instructor the same courtesy. CLASSROOM ACCESS The classroom is available to you during most evenings and weekends. Please make arrangements with the course instructor in advance. The campus security is not permitted to open a room for you without permission from the instructor. NAUTICAL WEB SITE There is a Nautical Web Site located within the Camosun College Site, http://camosun.ca/learn/programs/nautical/index.html , which contains additional course information and schedules as well as links to marine related sites. CAMPUS
SCS4
Start Date : January 4th, 2011
End Date : March 4th, 2011
Daily Class Times : 0830 - 1600
This is a course designed to provide ship’s officers and captains with the knowledge and skill required to: understand the basic design and construction of various types of vessels; perform stability calculations with emphasis on practical skills; extract data from hydrostatic tables and curves, perform calculations related to ship’s drafts, trim, list and initial stability.
This course follows the guidelines of STCW95, parallels the framework of the IMO Model Courses and fulfills the requirements of the applicable sections of TP2293 and IMO Model Courses 7.01 and 7.03.
COURSE GOALS
Upon successful completion of this course, learners will have:
1. Working knowledge and application of stability, trim and stress tables, diagrams and stress-calculating equipment
2. Understanding of fundamental actions to be taken in the event of partial loss of intact buoyancy
3. Understanding of the fundamentals of watertight integrity
COURSE OUTCOMES
Upon successful completion of this course, you will be able to meet the outcomes specified in TP2293:
Knowledge required
Definition of displacement; Given a displacement/draught curve or table find:
a) Displacement for given mean draughts;
b) Mean draught for given displacements;
c) The change in mean draught when given masses are loaded or discharged;
d) The mass of cargo to be loaded or discharged to produce a required change of draught;
Definition of light displacement and load displacement; Definition of deadweight; Ability to use a deadweight scale to find the deadweight and displacement of a ship at various draughts in seawater; Definition of tonnes per centimetre immersion; Why TPC varies with different draughts; Ability to use a deadweight scale to obtain TPC at given draughts;
Ability to use TPC obtained from a deadweight to find:
a) The change of mean draught when given masses are loaded or discharged;
b) The mass of cargo to be loaded or discharged to produce a required change of draught;
Definition of block coefficient (CB); Ability to calculate CB from given displacement and dimensions; Ability to calculate displacement from given CB and dimensions.
Buoyancy
Meaning of buoyancy; Definition of force of buoyancy; What is meant by reserve buoyancy;
Explain the importance of reserve buoyancy; Explain the purpose of load lines; Explain the requirement for maintaining water tight integrity; Ability to demonstrate an understanding of damage stability requirements for certain vessels; The reasons for damage stability requirements;
Ability to identify damage stability requirements for Type A vessels, Type (B-60) and Type (B-100) vessels; Identify equilibrium condition after flooding for Type A, and all Type B vessels; Identify damage stability requirements for passenger vessels.
Fresh Water Allowance
Why the draught of a ship decreases when it passes from fresh water to seawater and vice versa; Given the FWA and TPC for fresh water, ability to calculate the amount which can be loaded after reaching the summer load line when loading in fresh water before sailing into seawater; Ability to use a hydrometer to find the density of dock water; Given the density of dock water and TPC for seawater, ability to calculate the TPC for dock water; Given the density of dock water and FWA, ability to calculate the amount by which the appropriate load line may be submerged; Given the present draught amidships and the density of dock water, ability to calculate the amount to load to bring the ship to the appropriate load line in seawater.
Definition of centre of gravity (G); Definition of centre of buoyancy (B);
Definition of the lever GZ; How variations in displacement and GZ affect the stability of the ship;
Ability to draw a diagram of a heeled ship, showing:
a) The forces B and G;
b) The lever GZ
Initial stability
Definition of the transverse metacentre (M); Ability to draw a diagram of a ship heeled to a small angle and indicate G,B,Z and M; Definition of GM; Ability to show that for small angles of heel (q), GZ = GM X sin q;
Ability to describe the effect on a ship’s behavior of:
a) A large GM (stiff ship)
b) A small GM (tender ship)
Ability to use hydrostatic curves to find the height of the metacentre above the keel (KM) at given draughts; Given the values of KG, ability to use the values of KM obtained from hydrostatic curves to find the metacentre height, GM. Given a ship’s hydrostatic data and the disposition of cargo, fuel and water, calculate the metacentric height (GM); Ability to calculate the arrival GM from the conditions at departure and the consumption of fuel and water; Ability to identify when the ship will have the worst stability conditions during the passage; Ability to calculate the maximum weight which can be loaded at a given height above the keel to ensure a given minimum GM.
Angle of Loll
Ability to show that if G is raised above M, the couple formed by the weight and buoyancy force will turn the ship further from the upright; How B may move sufficiently to reduce the capsizing moment to zero at some angle of heel; Definition of angle of loll; An unstable ship may loll to either side, why this condition is potentially dangerous.
Curves of Statical Stability
Ability to identify cross curves (KN curves and MS curves); Derive the formula GZ = MS + GM sin; Derive the formula GZ = KN – KG sin; Derive GZ curves for stable and initially unstable ships from KN curves;
From a given curve of statical stability, ability to obtain:
a) The maximum righting lever and the angle at which it occurs;
b) The angle of vanishing stability;
c) The range of stability.
Ability to construct a GZ curve for a given displacement and KG and checks that the ship meets the minimum intact stability requirements; Ability to show how lowering the position of G increases all values of the righting lever and vice versa.
Ability to calculate the movement of G (GG1) from:
GG1 = mass added or removed X distance of mass from G
new displacement of the ship
GG1 = mass moved X distance mass is moved
displacement of the ship
Perform calculations as in the above objective to find the vertical and horizontal shifts of the centre of gravity resulting from adding, removing, moving or suspending masses; Ability to calculate, by using moments about the keel, the position of G after loading or discharging given masses at stated positions;
Ability to calculate the change in KG during a passage resulting from:
a) Consumption of fuel and stores
b) Absorption of water by a deck cargo
c) Accretion of ice on decks and superstructures given the masses and their positions.
List and its correction
Ability to show on a diagram the forces which cause a ship to list when G is to one side of the centre line; Ability to show on a diagram that the angle of list (q) is given by:
tan q = GG1
GM
Where GG1 is the transverse shift of G from the centre line.
Given the displacement, KM and KG of a ship, ability to calculate the angle of list resulting from loading or discharging a given mass at a stated position, or from moving a mass through a given transverse distance; With reference to moments about the centre line, ability to explain how the list may be removed; Given the displacement, GM and the angle of list of a ship, ability to calculate the mass to load or discharge at a given position to bring the ship upright; Given the displacement, GM and angle of list of a ship, ability to calculate the mass to move through a given transverse distance to bring the ship upright; Given the draught, beam and rise of the floor, ability to calculate the increase in draught resulting from a stated angle of list; Ability to determine the expected maximum heel during the loading or discharging of a heavy lift with the ship’s gear; Ability to calculate the increased draught resulting from the heel.
Effect of slack tanks
Ability to show by means of diagrams how the centre of gravity of the liquid in a partly filled tank moves during rolling.
Effect of wind and effect of water on deck
Understanding the effect of severe wind and rolling in associated sea conditions, especially in following seas; Effect of water on deck includes free surface effect.
Definition of trim; Definition of centre of flotation (CF); Ability to use hydrostatic data to find the position of the centre of flotation (CF) for various draughts; Definition of a trimming moment; Definition of the moment to change trim by 1 cm (MCT 1 cm); Ability to use hydrostatic curves/tables or deadweight scale to find the MCT 1 cm for various draughts; Given the value of MCT 1 cm, masses moved and the distances moved forward or aft, ability to calculate the change in trim; Given the value of MCT 1 cm, the position of the centre of flotation, masses added or removed and their distances forward of or abaft the centre of flotation, ability to calculate the change of trim; Given initial draughts and the position of the centre of flotation, ability to extend the calculation in the above objective to find the new draughts; Given initial draughts and TPC, ability to extend the calculation in the above objective to find the new draughts; Given initial draughts and TPC, ability to extend the calculation to find the new draughts; Ability to use a trimming table or trimming curves to determine changes in draughts resulting from loading, discharging or moving weights; Ability to calculate how to divide a given mass between two given locations to produce a required trim or maximum draught after loading; Ability to calculate the locations at which to load a given mass so as to leave the after draught unchanged ability to calculate final draughts and trim for a planned loading by considering changes to a similar previous loading.
General arrangement of different types of ship; Ability to draw an elevation of the principal ship types, showing holds, engine room, peak tanks, double bottom tanks, hatchways and position of bulkheads; Ability to draw an elevation of a typical crude oil carrier, showing bulkheads, cofferdams, pump-room, engine-room, bunker and peak tanks, cargo tanks and permanent ballast tanks; Ability to draw a plan view of a tanker, showing the arrangement of cargo and ballast tanks; Definitions of the different dimensions and forms..
Ship stresses
Describe in qualitative terms shear force and bending moments; What is meant by hogging and sagging; Ability to describe the loading conditions which give rise to hogging and sagging stresses; How hogging and sagging stresses are caused by the sea state;
How hogging and sagging stresses result in tensile or compressive forces in the deck and bottom structure; Describe water pressure loads on the ship’s hull; Describe liquid pressure loading on the tank structures; Ability to calculate the pressure at any depth below the liquid surface, given the density of the liquid; Describe the stresses set up by liquid sloshing in a partly filled tank; Describe racking stress and its causes; What is meant by panting and which part of the ship is affected;
What is meant by pounding or slamming and which part of the ship is affected; Describe the stress caused by localized loading; Ability to demonstrate understanding of modern methods of determining the effects of different loading and ballasting on the ship’s structure; Ability to use modern computer software for determining stress; Have a working knowledge of the stress tables; How output data from ship stress finding system may be used; Torsion stress particularly with reference to container ship loading; Ability to analyze the stress areas created by bending moments and shearing forces derived by a stress indicator; Analyze the causes and effects of shearing forces and bending moments on ship’s structures; Definition of bending moment; Definition of Shearing forces; Ability to extract information from shear force and bending moment diagrams; Describe the constructional features, which compensate for stress.
Hull structure
Ability to identify structural components on ship’s plans and drawings:
a) Frames, floor, transverse frames, deck beams, knees, brackets
b) Shell plating, decks, tank top, stringers
c) Bulkheads and stiffeners, pillars
d) Hatch girders and beams, coamings, bulwarks
e) Bow and stern framing, cant beams, breasthooks
Ability to describe and illustrate standard steel sections:
a) Flat plate
b) Offset bulb plate
c) Equal angle
d) Unequal angle
e) Channel
f) Tee
Ability to identify longitudinal, transverse and combined systems of framing on transverse sections of the ships; Ability to sketch the arrangement of frames, webs and transverse members for each system; Ability to illustrate double-bottom structure for longitudinal and transverse framing; Ability to illustrate hold drainage systems and related structure; Ability to illustrate a duct keel; Ability to sketch the deck edge, showing attachment of sheer strake and stringer plate; Ability to sketch a radiused sheer strake and attached structure; Describe the stress concentration in the deck round hatch openings; Explain compensation for loss of strength at hatch openings; Ability to sketch a transverse section through a hatch coaming, showing the arrangement of coamings and deep webs; Ability to sketch a hatch corner in plan view, showing the structural arrangements; Ability to sketch deck-freeing arrangements, scuppers, freeing ports, open rails; Ability to illustrate the connection of superstructures to the hull at the ship’s side; Ability to sketch a plane bulkhead, showing connections to deck, sides and double bottom and the arrangement of stiffeners; Ability to sketch a corrugated bulkhead; Why transverse bulkheads have vertical corrugations and for-and-aft bulkheads have horizontal ones; Ability to describe the purpose of bilge keels and how they are attached to the ship’s side.
Bow and Stern
Describe the provisions of additional structural strength to withstand pounding; Describe and illustrate the structural arrangements forward to withstand panting; Describe the function of the sternframe; Describe and sketch a sternframe for a single-screw ship; Describe and illustrate the construction of a transom stern, showing the connections to the sternframe.
Fittings
Describe and sketch an arrangement of modern weather-deck mechanical steel hatches;
How water tightness is achieved at the coamings and cross joints; Describe the cleating arrangements for the hatch covers; Ability to sketch an oil tight hatch cover; Describe roller, multi-angle, pedestal and panama fairleads; Ability to sketch mooring bitts, showing their attachments to the deck; Ability to sketch typical forecastle mooring and anchoring arrangements, showing the leads of moorings; Describe the construction and attachment to the deck of tension winches and explain how they are used; Describe the anchor handling arrangements from hawse pipe to spurling pipe; Describe the construction of chain lockers and how cables are secured in the lockers; How to secure anchors and make spurling pipes watertight in preparation for a sea passage; Describe the construction and use of a cable stopper; Describe the construction of masts and Sampson posts and how they are supported at the base; Describe the construction of derricks and deck cranes; Describe the bilge piping system of a cargo ship; Describe and sketch a bilge strum box; Describe a ballast system in a cargo ship; Describe the arrangement of a fire main; Describe the provision of sounding pipes and sketch a sounding pipe arrangement; Describe the fitting of air pipes to ballast tanks or fuel oil tanks; Describe the arrangement of fittings and lashings for the carriage of containers on deck.
Ability to describe the action of the rudder in steering a ship; Drawing of modern rudders: semi balanced, balanced and spade; Explain the purpose of the rudder carrier and pintles; How the weight of the rudder is supported by the rudder carrier; Ability to describe a rudder trunk; Ability to describe the arrangement of a watertight gland round the rudder stock; The principle of screw propulsion; Describe a propeller and define boss, rake, skew, face, back, tip, radius, pitch;
Compare fixed-pitch with controllable-pitch propellers; Ability to sketch the arrangement of an oil lubricated stern tube and tail shaft; Ability to sketch a cross-section of a shaft tunnel; Why the shaft tunnel must be of watertight construction and how water is prevented from entering the engine-room if the tunnel becomes flooded.
Load lines and draught marks
Explain where the deck line is marked; Definition of freeboard; What is meant by assigned summer freeboard; Ability to distinguished between ships of Type A and Type B for the purposes of computation of freeboard; Ability to draw to scale the load line mark and the load lines for a ship given summer moulded draught, displacement and tonnes per centimetre immersion in salt water; Ability to use the chart of zones and seasonal areas to determine the load lines which apply for a particular passage; Given the ship’s hydrostatic data and the daily consumption of fuel and water, ability to determine the minimum departure freeboard and quantity to load, taking into account the zones, seasonal zones and areas through which the ship will pass; Ability to calculate the maximum quantity to load, taking account of loading, discharging and bunkering at an intermediate port or ports, so as to comply throughout with the load line regulations; Demonstrate how to read draughts.
EVALUATION PLAN – APPROVED COURSE
EVALUATION
INSTRUMENT
M/C & S/A QUESTIONS
ESSAY
QUESTIONS
CALCULATION
QUESTIONS
PERCENTAGE
/100
The pass mark is an average of 70% with a minimum of at least 60% on any exam or assignment. 90% attendance is required.
Progress in this course will require class participation and completion of exercises. Principles and problem solving in this course build on themselves; missed material frequently results in difficulties in later stages of the course. It will be your responsibility to catch up on any missed lectures and exercises.
MATHEMATICS
A math refresher course is available between 1500 and 1700, Monday to Thursday during the first 2 weeks. Refer to the schedule. This math refresher is specific to this course and available to registered nautical students only. Math (general college) tutorial is available throughout the course; refer to math handout for additional information.
BOOKS & SUPPLIES
Mandatory:
1. Student Manual
2. Ship Knowledge by Klaas Van Dokkum
3. Ship Stability for Mates/Masters by Seamanship International
Recommended (additional):
Handout material will be given on loan bases and will include a stability book. All loaned material must be returned to the instructor by the last day of the course.
A scientific calculator capable of performing trigonometric functions, inverse functions, etc is a must for the course. Use of tables to problem solve will require more time than is available. The recommended calculator is the Sharp EL-531W DAL.
INCOME SUPPORTED STUDENTS
Any student on any form of income support may be required to “sign in” daily. Arrangements will be made with the staff in the Trades and Technology office for signing in.
ADDITIONAL ACADEMIC ASSISTANCE
If you require additional assistance with study skills, mathematics, etc., the following services are available to you on campus:
Ø Learning Skills Counselor located in Campus Centre at the counseling/Advising centre
Ø Math Review – TB260 between 1500 & 1700 Monday – Thursday for first 2 weeks of class.
Ø Math Lab (available sometimes) located in Technologies Centre 142 (down stairs) & in the Jack White Building, location to be discussed.
As well, if you would like to have your learning style assessed, contact Advising located in Campus Centre, near registration or call 370-3550.
LOCKERS
Lockers may be rented from the bookstore at a monthly fee and a lock deposit. Make sure that you identify yourself as a Nautical Student. Lockers next to the classrooms are reserved for you.
STUDENT ID CARD
You must get one of these. Available from the library, you must present yourself along with photo ID and confirmation of current local address. The card will allow you access to the library, discounts at specific venues, may be used as a photocopy card and as a bus pass.
BUS PASS
May be included in the cost of your tuition, obtained from the library. It is set up on your College ID. You swipe the card when entering the bus.
COMPUTER ACCESS
Included in the cost of your tuition. You are entitled to set up an e-mail account and have access to the World Wide Web in the computer labs located at Camosun College. You must go to the library to set up your account, username and password. Refer to the posted instructions for set up and logon procedure. In addition to access to e-mail and the WWW, computers in our lab have training programs for stability.
When using the computers/internet, please do not download programs, files, etc to the hard drive. If there is anything that you would like to save, please do so on a disk. If you do find a site that you feel is of interest to the class, please note the address and discuss it with the instructor. As well, please do not set up personalized folders.
Please note that site access is closely monitored by Computing Services and Campus Security. Refer to the posted Lab Procedures.
NAUTICAL LIBRARY
There is a very good collection of old and new nautical texts located in the Instructor’s office, room 267. The texts are both the property of the college and personally owned by myself. If you want access, please ask me and a time will be arranged. This room/office is not to be accessed without an instructor present.
LIBRARY
Located in Campus Centre, level 3. It contains a nautical section with a variety/limited number of nautical text. There is a restriction on the loan period and fine structure in place for overdue books. Each loan period is at a maximum of 3 weeks with a maximum of 3 renewals (9 weeks total). This is based on no other student needing access to the text. Renewals may be made online.
LUNCH TIME WORKSHOPS
Free workshops are available at the learning skills centre, located in the Campus Centre. Refer to posting around the building.
PRINTING/PHOTOCOPYING
There are photocopy machines located throughout the campus and in the library, accessible with a Card that may be purchased at the bookstore or an account set up on your College ID. The computers, located in the lab, are connected to the printer and it is for your use. In addition, the Camosun Print Shop provides a service to students (at a fee). If you have large amounts of copying to do, the print shop may be your best option.
PARKING
Parking is available in designated lots around the campus and may be accessed with a ticket pass purchased though a dispenser or a longer term pass purchased through the machines located on campus. Please note that the reserved spaces are not for students. Tickets may be purchased for periods of 4 hours, 1 day, weekly and monthly.
Campus parking is contracted to Robbins and is not the responsibility of the college. They have their own monitors and issue their own parking violation tickets. Any dispute that you may have must be directed to this company.
FOOD AND DRINK
Available at the Cook Training Centre (Helmut Huber Bldg) and the Coffee Shop. Please refer to posted operating hours. As well, coffee and snacks are frequently available at satellite venues throughout the campus.
The classroom (not the computer lab or electronics lab) may be used during lunch hours and coffee breaks and coffee is permitted during regular class hours. Ensure that all litter is disposed of in the garbage container and not left in the desks. This is both a personal and a public health concern. Consumption of food is not permitted during class.
SMOKING
Permitted outside in designated locations away from the entrance to the building, wherever you can find a butt can. The deck may not be used for smoking.
CELL PHONES AND PAGERS
Please ensure that the audio ringers on these devices are turned off during class and lab times. They are disruptive to both the instructor and your fellow students.
CLASSROOM BREAKS
We all need them. As the course proceeds, the majority of you will find yourselves wanting to spend your coffee breaks and lunch hours completing homework or asking questions to the instructor or fellow student. This will burn you out. Take your breaks to go for a walk or read a book, you need them. If possible, please allow the instructor the same courtesy.
CLASSROOM ACCESS
The classroom is available to you during most evenings and weekends. Please make arrangements with the course instructor in advance. The campus security is not permitted to open a room for you without permission from the instructor.
NAUTICAL WEB SITE
There is a Nautical Web Site located within the Camosun College Site, http://camosun.ca/learn/programs/nautical/index.html , which contains additional course information and schedules as well as links to marine related sites.
CAMPUS